ranking of vector with non-unique elements

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I need to perform fast ranking of the vector with non-unique elements, like in the following example:
F = [10.1 31.0 20.5 20.5 10.1] -> rankF = [3 1 2 2 3]
So far I am using the following code:
[~,~,iFu] = unique(F,'stable');
[~,iFs] = sort(F,'descend');
[~,iFs] = sort(iFs);
[~, ~, rankF] = unique(iFs(iFu));
But, I am not sure if this code is really effective. Is there any better (faster) way how to solve this problem?

Accepted Answer

Johannes Fischer
Johannes Fischer on 18 Sep 2019
So you want to order starting with the highest value?
F = [10.1 31.0 20.5 20.5 10.1]
[~, ~, rankF] = unique(max(F)-F)
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